Which of the following is truly classified as a parasite?

  • A
    Female Anopheles bites and sucks blood from humans.
  • B
    Human fetus developing inside the uterus obtains nutrition from the mother.
  • C
    Head louse lives on the human scalp and lays eggs on human hair.
  • D
    Cuckoo lays its eggs in the crow's nest.

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If the '$+$' sign is used for a beneficial interaction,the '$-$' sign for a detrimental interaction,and the '$0$' sign for a neutral interaction,then which population interaction is represented by '$+$' and '$-$'?

$E. coli$ in the human colon behaves as:

Choose the incorrect sentence.

In interference competition,........

Discuss the various types of positive interactions between species.

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